Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-07-28
Phys.Rev.Lett.101:181301,2008
Astronomy and Astrophysics
Astrophysics
4 pages, 2 figures
Scientific paper
10.1103/PhysRevLett.101.181301
The critical issue in cosmology today lies in determining if the cosmological constant is the underlying ingredient of dark energy. Our profound lack of understanding of the physics of dark energy places severe constrains on our ability to say anything about its possible dynamical nature. Quoted errors on the equation of state, w(z), are so heavily dependent on necessarily over-simplified parameterisations they are at risk of being rendered meaningless. Moreover, the existence of degeneracies between the reconstructed w(z) and the matter and curvature densities weakens any conclusions still further. We propose consistency tests for the cosmological constant which provide a direct observational signal if Lambda is wrong, regardless of the densities of matter and curvature. As an example of its utility, our flat case test can warn of a small transition from w(z)=-1 of 20% from SNAP quality data at 4-sigma, even when direct reconstruction techniques see virtually no evidence for deviation from Lambda. It is shown to successfully rule out a wide range of non-Lambda dark energy models with no reliance on knowledge of Omega_m using SNAP-quality data and a large range for using 10^5 supernovae as forecasted for LSST.
Clarkson Chris
Zunckel Caroline
No associations
LandOfFree
A litmus test for Lambda does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with A litmus test for Lambda, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A litmus test for Lambda will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-312489